Air conditioning unit and access door assembly

ABSTRACT

An air conditioning appliance may include a unit enclosure, a housing, a heat exchanger, a compressor, and an access door. The unit enclosure a system compartment. The housing may be received within the system compartment. The heat exchanger may be disposed in the housing. The compressor may be in fluid communication with the heat exchanger to circulate a refrigerant through the heat exchanger. The access door may be attached to the unit wall proximal to the opening through the unit enclosure. The access door may extend between a bottom end and a top end. The access door may define a primary louver set and a secondary louver set in fluid parallel to permit airflow through the access door. The primary louver set may be defined proximal to the bottom end. The secondary louver set may be defined proximal to the top end above the primary louver set.

FIELD OF THE INVENTION

The present subject matter relates generally to air conditioning units, and more particularly to access doors for vertical air conditioning units.

BACKGROUND OF THE INVENTION

Air conditioners or air conditioner units are conventionally used to adjust the temperature within structures such as dwellings and office buildings. In particular, one-unit type room air conditioner units, such as single package vertical units (SPVU), or package terminal air conditioners (PTAC) may be used to adjust the temperature in, for example, a single room or group of rooms of a structure. Such units may be especially useful in the context of a hotel or office building where users desire control of the temperature within a specific room of a larger building structure. A typical one-unit type air conditioner or air conditioning appliance includes an indoor portion and an outdoor portion. The indoor portion generally communicates (e.g., exchanges air) with the area within a building, and the outdoor portion generally communicates (e.g., exchanges air) with the area outside a building. Accordingly, the air conditioner unit generally extends through, for example, an outer wall of the structure. Generally, a fan may be operable to rotate to motivate air through the indoor portion. Another fan may be operable to rotate to motivate air through the outdoor portion. A sealed cooling system including a compressor is generally housed within the air conditioner unit to treat (e.g., cool or heat) air as it is circulated through, for example, the indoor portion of the air conditioner unit. One or more control boards are typically provided to direct the operation of various elements of the particular air conditioner unit.

Some conventional air conditioning units include an access door or panel for allowing a technician to access the cooling system or other serviceable parts within the air conditioning unit. Generally, such access doors or panels define one or more openings (e.g., louvers) such that air is permitted to flow through the access door and into the air conditioning unit. Typically, the openings are defined at a relatively low position on the access door to align with an air inlet of the air conditioning unit and ensure air is drawn from the base of the room.

In practice, various issues can arise with conventional units. For instance, it is common for the openings in an access door to become blocked, such as by a hotel room customer who inadvertently places a bag or piece of furniture on the ground in front of the access door. This may, in turn, lead to reduced airflow to the air conditioning unit, which generally reduces performance. If a heating unit is provided on the air conditioning unit, heated air may stagnate within the unit, which may lead to a cutoff switch being tripped. In extreme cases, the air conditioning unit itself may become damaged. In spite of these risks, though, it can be very difficult to discern when a unit has been blocked or to prevent it from occurring.

As a result, it would be useful to provide an air conditioning appliance or door assembly that includes features for addressing one or more of the above issues. In particular, it may be advantageous to provide an appliance or assembly with features for ensuring airflow to an air conditioning unit, even in instances where one or more openings have become blocked.

BRIEF DESCRIPTION OF THE INVENTION

Aspects and advantages of the invention will be set forth in part in the following description, or may be obvious from the description, or may be learned through practice of the invention.

In one exemplary aspect of the present disclosure, an air conditioning appliance is provided. The air conditioning appliance may include a unit enclosure, a housing, a heat exchanger, a compressor, and an access door. The unit enclosure may have a unit wall and define a system compartment. The unit wall may define an opening therethrough. The housing may be received within the system compartment. The heat exchanger may be disposed in the housing. The compressor may be in fluid communication with the heat exchanger to circulate a refrigerant through the heat exchanger. The access door may be attached to the unit wall proximal to the opening. The access door may extend along the vertical direction between a bottom end and a top end. The access door may define a primary louver set and a secondary louver set in fluid parallel to permit airflow through the access door to the housing. The primary louver set may be defined proximal to the bottom end. The secondary louver set may be defined proximal to the top end above the primary louver set.

In one exemplary aspect of the present disclosure, a door assembly for an air conditioning appliance is provided. The door assembly may include an access door that is mountable to a wall in front of a housing of the air conditioning appliance. The access door may extend along a vertical direction from a bottom end to a top end. The access door may define a primary louver set and a secondary louver set. The primary louver set may extend through the access door proximal to the bottom end to permit airflow through the access door to a front air inlet. The secondary louver set may be in fluid parallel to the primary louver set to selectively permit airflow through the access door to a front air inlet. The secondary louver set may further be defined proximal to the top end above the primary louver set and the front air inlet.

These and other features, aspects and advantages of the present invention will become better understood with reference to the following description and appended claims. The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.

BRIEF DESCRIPTION OF THE DRAWINGS

A full and enabling disclosure of the present invention, including the best mode thereof, directed to one of ordinary skill in the art, is set forth in the specification, which makes reference to the appended figures.

FIG. 1 provides a perspective view of an air conditioning appliance according to exemplary embodiments of the present disclosure.

FIG. 2 provides a partially-transparent elevation view of the exemplary air conditioner unit of FIG. 1.

FIG. 3 provides a cut-away perspective view of a housing of the exemplary air conditioner unit of FIG. 1, with an access door and access door frame of an access door assembly detached.

FIG. 4 provides a schematic sectional view of the exemplary air conditioner unit of FIG. 1 during use in an unobstructed state.

FIG. 5 provides a schematic sectional view of the exemplary air conditioner unit of FIG. 1 during use in an obstructed state.

FIG. 6 provides a perspective view of an access door assembly for an air conditioning appliance according to exemplary embodiments of the present disclosure.

FIG. 7 provides a schematic section view of a portion of an access door assembly having an air damper in a closed position according to exemplary embodiments of the present disclosure.

FIG. 8 provides a schematic section view of a portion of an access door assembly having an air damper in an open position state according to exemplary embodiments of the present disclosure.

FIG. 9 provides a partially exploded perspective view of an access door assembly having an air damper in for an air conditioning appliance according to exemplary embodiments of the present disclosure.

FIG. 10 provides a cross-sectional perspective view of a portion of an air damper in a closed position for an access door assembly according to exemplary embodiments of the present disclosure.

FIG. 11 provides a cross-sectional perspective view of a portion of an air damper in an open position for an access door assembly according to exemplary embodiments of the present disclosure.

FIG. 12 provides a perspective view of a portion of an access door assembly having an air damper in a closed position according to exemplary embodiments of the present disclosure.

FIG. 13 provides a perspective view of a portion of an access door assembly having an air damper in an open position state according to exemplary embodiments of the present disclosure.

FIG. 14 provides a perspective view of an access door assembly for an air conditioning appliance according to exemplary embodiments of the present disclosure.

DETAILED DESCRIPTION

Reference now will be made in detail to embodiments of the invention, one or more examples of which are illustrated in the drawings. Each example is provided by way of explanation of the invention, not limitation of the invention. In fact, it will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the scope of the invention. For instance, features illustrated or described as part of one embodiment can be used with another embodiment to yield a still further embodiment. Thus, it is intended that the present invention covers such modifications and variations as come within the scope of the appended claims and their equivalents. As used herein, the terms “includes” and “including” are intended to be inclusive in a manner similar to the term “comprising.” Similarly, the term “or” is generally intended to be inclusive (i.e., “A or B” is intended to mean “A or B or both”). The terms “upstream” and “downstream” refer to the relative flow direction with respect to fluid flow in a fluid pathway. For example, “upstream” refers to the flow direction from which the fluid flows, and “downstream” refers to the flow direction to which the fluid flows. Furthermore, as used herein, terms of approximation, such as “approximately,” “substantially,” or “about,” refer to being within a ten percent margin of error.

Turning now to the figures, FIGS. 1 through 3 illustrate an exemplary air conditioning appliance (e.g., air conditioner 100). As shown, air conditioner 100 may be provided as a one-unit type air conditioner 100, such as a single-package vertical unit. Air conditioner 100 includes a package housing 114 supporting an indoor portion 112 and an outdoor portion 110.

Generally, air conditioner 100 defines a vertical direction V, lateral direction L, and transverse direction T. Each direction V, L, T is perpendicular to each other, such that an orthogonal coordinate system is generally defined.

In some embodiments, housing 114 contains various other components of the air conditioner 100. Housing 114 may include, for example, a rear opening 116 (e.g., with or without a grill or grate thereacross) and a front opening 118 (e.g., with or without a grill or grate thereacross) may be spaced apart from each other along the transverse direction T. The rear opening 116 may be part of the outdoor portion 110, while the front opening 118 is part of the indoor portion 112. Components of the outdoor portion 110, such as an outdoor heat exchanger 120, outdoor fan 124, and compressor 126 may be enclosed within housing 114 between front opening 118 and rear opening 116. In certain embodiments, one or more components of outdoor portion 110 are mounted on a basepan 136, as shown.

During certain operations, air may be drawn to outdoor portion 110 through rear opening 116. Specifically, an outdoor inlet 128 defined through housing 114 may receive outdoor air motivated by outdoor fan 124. Within housing 114, the received outdoor air may be motivated through or across outdoor fan 124. Moreover, at least a portion of the outdoor air may be motivated through or across outdoor heat exchanger 120 before exiting the rear opening 116 at an outdoor outlet 130. It is noted that although outdoor inlet 128 is illustrated as being defined above outdoor outlet 130, alternative embodiments may reverse this relative orientation (e.g., such that outdoor inlet 128 is defined below outdoor outlet 130) or provide outdoor inlet 128 beside outdoor outlet 130 in a side-by-side orientation, or another suitable discrete orientation.

As shown, indoor portion 112 may include an indoor heat exchanger 122, a blower fan 142, and a heating unit 132. These components may, for example, be housed behind the front opening 118. A bulkhead 134 may generally support or house various other components or portions thereof of the indoor portion 112, such as the blower fan 142. Bulkhead 134 may generally separate and define the indoor portion 112 and outdoor portion 110 within housing 114. Additionally or alternatively, bulkhead 134 or indoor heat exchanger 122 may be mounted on basepan 136 (e.g., at a higher vertical position than outdoor heat exchanger 120).

During certain operations, air may be drawn to indoor portion 112 through front opening 118. Specifically, an indoor inlet 138 defined through housing 114 may receive indoor air motivated by blower fan 142. At least a portion of the indoor air may be motivated through or across indoor heat exchanger 122 (e.g., before passing to bulkhead 134). From blower fan 142, indoor air may be motivated (e.g., across heating unit 132, which may include one or more electric or resistive heating elements) and returned to the indoor area 168 of the room through an indoor outlet 140 defined through housing 114 (e.g., above indoor inlet 138 along the vertical direction V). Optionally, one or more conduits (not pictured) may be mounted on or downstream from indoor outlet 140 to further guide air from air conditioner 100. It is noted that although indoor outlet 140 is illustrated as generally directing air upward, it is understood that indoor outlet 140 may be defined in alternative embodiments to direct air in any other suitable direction.

Outdoor and indoor heat exchanger 120, 122 may be components of a thermodynamic assembly (i.e., sealed system), which may be operated as a refrigeration assembly (and thus perform a refrigeration cycle) or, in the case of the heat pump unit embodiment, a heat pump (and thus perform a heat pump cycle). Thus, as is understood, exemplary heat pump unit embodiments may be selectively operated perform a refrigeration cycle at certain instances (e.g., while in a cooling mode) and a heat pump cycle at other instances (e.g., while in a heating mode). By contrast, exemplary A/C exclusive unit embodiments may be unable to perform a heat pump cycle (e.g., while in the heating mode), but still perform a refrigeration cycle (e.g., while in a cooling mode).

The sealed system may, for example, further include compressor 126 (e.g., mounted on basepan 136) and an expansion device (e.g., expansion valve or capillary tube—not pictured), both of which may be in fluid communication with the heat exchangers 120, 122 to flow refrigerant therethrough, as is generally understood. The outdoor and indoor heat exchanger 120, 122 may each include coils 146, 148, as illustrated, through which a refrigerant may flow for heat exchange purposes, as is generally understood.

A plenum 166 may be provided to direct air to or from housing 114. When installed, plenum 166 may be selectively attached to (e.g., fixed to or mounted against) housing 114 (e.g., via a suitable mechanical fastener, adhesive, gasket, etc.) and extend through a structure wall 150 (e.g., an outer wall of the structure within which air conditioner 100 is installed). For instance, plenum 166 may extend (e.g., parallel to the transverse direction T) through a hole or channel 152 in the structure wall 150 that passes from an internal surface 154 to an external surface 156.

The operation of air conditioner 100 including compressor 126 (and thus the sealed system generally), blower fan 142, outdoor fan 124, heating unit 132, and other suitable components may be controlled by a control board or controller 158. Controller 158 may be in communication (via for example a suitable wired or wireless connection) to such components of the air conditioner 100. By way of example, the controller 158 may include a memory and one or more processing devices such as microprocessors, CPUs or the like, such as general or special purpose microprocessors operable to execute programming instructions or micro-control code associated with operation of air conditioner 100. The memory may be a separate component from the processor or may be included onboard within the processor. The memory may represent random access memory such as DRAM, or read only memory such as ROM or FLASH.

Air conditioner 100 may additionally include a control panel 160 and one or more user inputs 162, which may be included in control panel 160. The user inputs 162 may be in communication with the controller 158. A user of the air conditioner 100 may interact with the user inputs 162 to operate the air conditioner 100, and user commands may be transmitted between the user inputs 162 and controller 158 to facilitate operation of the air conditioner 100 based on such user commands. A display 164 may additionally be provided in the control panel 160, and may be in communication with the controller 158. Display 164 may, for example be a touchscreen or other text-readable display screen, or alternatively may simply be a light that can be activated and deactivated as required to provide an indication of, for example, an event or setting for the air conditioner 100.

When assembled and installed, air conditioner 100 may be located within a system compartment 206 defined by unit enclosure 200. Unit enclosure 200 may be a stand-alone structure in which air conditioner 100 is contained. Additionally or alternatively, unit enclosure 200 may be provided within a building (e.g., a house, an office, or an apartment building). Unit enclosure 200 may include one or more unit walls 202. As shown, one or more of the walls 202 may extend in the vertical direction V and the transverse direction T or the lateral direction L. A service opening or access opening (e.g., service opening 204) may further be defined in one of the walls 202 (e.g., to generally permit access to system compartment 206). For example, service opening 204 may be generally rectangular in shape.

A door assembly 210 may be removably mounted to the wall 202 (e.g., via one or more mechanical fasteners, adhesives, etc.). When connected, the door assembly 210 may surround the service opening 204 and provide selectable access to the air conditioner 100. Door assembly 210 may include a door frame 212 and an access door 214. A shape of door frame 212 may correspond to a shape of service opening 204.

Turning now to FIGS. 3 through 6, FIGS. 4 and 5 illustrate airflow through air conditioner 100 and the indoor area 168 of a room, generally, during various states. FIG. 6 provides a perspective view of door assembly 210 (in isolation) according to exemplary embodiments.

As shown, when assembled, access door 214 generally extends along the vertical direction V between a bottom end 216 and a top end 218. Access door 214 my further extend along the lateral direction between a first side 220 to a second side 222 as well as along the transverse direction between a front face 224 and a rear face 226.

Between the bottom end 216 and the top end 218 a plurality of louver openings 232 are defined to permit air to generally pass between an indoor area 168 of the corresponding room and the system compartment 206. In particular, a primary louver set 234 and a secondary louver set 236 may be defined, each including one or more discrete louver openings 232. Thus, the primary louver set 234 and the secondary louver set 236 may be in fluid parallel (i.e., define parallel flow paths for air through access door 214). When installed, access door 214 may essentially cover the wall opening 204 and thus, substantially all of the air to system compartment 206 from the indoor area 168 may be forced to pass through one or more of the louver openings 232. For instance, as shown in FIG. 4, when primary louver set 234 is unobstructed, air may be permitted to flow to the system compartment 206 through one or both of the louver sets 234, 236. Advantageously, though, and as shown in FIG. 5, even when primary louver set 234 is obstructed (e.g., by a piece of luggage or furniture), air may permitted to flow through secondary louver set 236, which may be disposed at a location that is not easily obstructed.

In certain embodiments, the secondary louver set 236 is defined above the primary louver set 234. Thus, the louver openings 232 of the secondary louver set 236 may be defined at a higher height than the louver openings 232 of the primary louver set 234. In some such embodiments, the primary louver set 234 and the secondary louver set 236 are defined closer to opposite vertical ends 216, 218 of access door 214. Specifically, the primary louver set 234 may be defined proximal to bottom end 216 (i.e., closer to bottom end 216 than it is to top end 218). Thus, the bottommost louver opening 232 of primary louver set 234 may be closer to bottom end 216 than the uppermost louver opening 232 of primary louver set 234 is to top end 218. Similarly, the secondary louver set 236 may be defined proximal to top end 218. Thus, the uppermost louver opening 232 of secondary louver set 236 may be closer to top end 218 than the lowermost louver opening 232 of secondary louver set 236 is to bottom end 216.

In optional embodiments, the secondary louver set 236 is defined not only above (e.g., at a higher height) than primary louver set 234, but also above air inlet 138. Additionally or alternatively, primary louver set 234 may be generally aligned (e.g., at a common or overlapping height) with air inlet 138. A more direct or shorter air path may thus be defined between primary louver set 234 and air inlet 138 than the path defined between secondary louver set 236 and air inlet 138. In turn, airflow through primary air inlet 138 may be prioritized over airflow through secondary louver set 236 (e.g., when neither louver set 234, 236 is obstructed).

In additional or alternative embodiments, secondary louver set 236 may define a higher airflow resistance than the primary louver set 234. Such resistance may be influenced, for instance, by the size or shape of the louver openings 232 or the size or shape of the secondary louver set 236 overall. For instance, the secondary louver set 236 may define a smaller cumulative vent opening (e.g., total cross sectional area of all of the louver openings 232 of secondary louver set 236) than the cumulative vent opening defined by primary louver set 234. During use, a higher pressure may thus be required to draw the same volume of air through secondary louver set 236 as primary louver set 234.

In some embodiments, the primary louver set 234 and the secondary louver set 236 are spaced apart (e.g., along the vertical direction V). For instance, a solid panel segment 238 that is continuous or otherwise non-permeable to air from first side 220 to second side 222 may separate primary louver set 234 from secondary louver set 236. Optionally, the solid panel segment 238 may define a vertical height that is greater than or equal to a vertical height of the secondary louver set 236 or the primary louver set 234. Thus, the vertical distance separating the primary louver set 234 from the secondary louver set 236 may be greater than or equal to the vertical distance spanned by all of the louver openings 232 of either (or both of) the secondary louver set 236 or the primary louver set 234.

As illustrated, a filter panel 240 may be mounted to the access door 214 (e.g., at or against the rear face 226). For instance, one or more clips, grooves, or mechanical fasteners may be provided on access door 214 to hold filter panel 240, as would be understood. Moreover, the filter panel 240 may include a suitable filtration media (e.g., fiberglass, pleated cellulose, etc.) to filter dust or microbes from the air flowing through access door 214, as would also be understood. Optionally, filter panel 240 may cover the primary louver set 234 such that any air through primary louver set 234 is forced to pass through filter panel 240 before reaching air inlet 138. Additionally or alternatively, filter panel 240 may be spaced apart from secondary louver set 236 such that air through secondary louver set 236 bypasses filter panel 240.

Turning now generally to FIGS. 6 through 14, in optional embodiments a movable air damper 250 is provided with access door 214 to selectively cover secondary louver set 236 (e.g., without covering or affecting primary louver set 234). For instance, air damper 250 may be mounted to access door 214 at the rear face 226. In some embodiments, air damper 250 is mounted proximal to top end 218. Generally, air damper 250 may be movable between a closed position restricting or preventing airflow through secondary louver set 236 (e.g., to system compartment 206) and an open position permitting airflow through secondary louver set 236 (e.g., to system compartment 206 or air inlet 138). In both positions, air damper 250 may be spaced apart from primary louver set 234.

Turning especially to FIGS. 6 through 8, air damper 250 may be pivotably mounted to access door 214. For instance, air damper 250 may be hinged to rotate about a pivot axis above secondary louver set 236. In the closed position, air damper 250 may rest against at least a portion of rear face 226, thereby blocking the backside of the louver openings 232 of secondary louver set 236, as illustrated in FIG. 7. By contrast, in the open position, air damper 250 may be pivoted apart from rear face 226 to permit air to flow through secondary louver set 236, as illustrated in FIG. 8.

In some such embodiments, air damper 250 is configured as a passive damper, movable between in the closed and open positions based on a pressure differential between system compartment 206 and the indoor area 168 of the corresponding room. For instance, when primary louver set 234 is generally unobstructed during activation of air conditioner 100, air damper 250 may be able to stay substantially shut (e.g., in the closed position) while an airflow from the indoor area 168 to system compartment 206 is motivated through the primary louver set 234. By contrast, when primary louver set 234 is obstructed during activation of air conditioner 100, air damper 250 may be forced to the open position by the pressure generated at air conditioner 100 to allow an airflow from the indoor area 168 to system compartment 206 through the secondary louver set 236.

Turning especially to FIGS. 9 through 13, air damper 250 may be slidably mounted to access door 214. For instance, air damper 250 may be disposed on rear face 226 to slide therealong. Moreover, air damper 250 may define a complementary set of openings 252 that are generally matched (e.g., in size or shape) to the openings 232 of secondary louver set 236. In the closed position, the complementary set of openings 252 may be spaced apart (e.g., vertically offset) from the openings 232 of secondary louver set 236, thereby blocking the backside of the louver openings 232 of secondary louver set 236, as illustrated in FIGS. 10 and 13. By contrast, in the open position, the complementary set of openings 252 may be aligned (e.g., disposed at the same vertical height or otherwise in fluid communication) with the openings 232 of secondary louver set 236 to permit air to pass between both, as illustrated in FIGS. 11 and 12.

Optionally, a message slot 260 may be defined through access door 214 (e.g., below or above secondary louver set 236). Message slot 260 may be configured to selectively align with a visual alert region 254 defined on air damper 250 (e.g., as visible text, picture, contrasting color, etc.) to visually notify a user when air damper 250 has been moved to the open position. For instance, in the closed position, the visual alert region 254 may be spaced apart (e.g., vertically offset) from the message slot 260 of secondary louver set 236 such that a blank or unadorned region of air damper 250 is visible through message slot 260, as illustrated in FIG. 13. By contrast, in the open position, the visual alert region 254 may be aligned (e.g., disposed at the same vertical height) with the message slot 260 to permit a user to see the visual alert region 254 through the message slot, as illustrated in FIG. 12.

In certain embodiments, air damper 250 is selectively actuated by a damper motor 256 in mechanical communication with the air damper 250 (e.g., mounted on access door 214). The damper motor 256 may be in operable communication (e.g., electrical or wireless communication) with the controller 158 to move air damper 250 between the open and closed positions based on one or more signals received from the controller 158. For instance, controller 158 may direct the air damper 250 to the open position in response to detecting a temperature that exceeds a predetermined threshold (e.g., at a temperature sensor within housing 114, as would be understood).

Additionally or alternatively, turning briefly to FIG. 14, a manual slider 258 may be mounted to air damper 250 to permit a user to physically move air damper 250 between the open and closed positions. For instance, the manual slider 258 may be fixed to air damper 250 through a guide slot at the front face 224. Thus, a user may be able to grasp and move manual slider 258 along the guide slot without directly engaging or seeing air damper 250.

This written description uses examples to disclose the invention, including the best mode, and also to enable any person skilled in the art to practice the invention, including making and using any devices or systems and performing any incorporated methods. The patentable scope of the invention is defined by the claims, and may include other examples that occur to those skilled in the art. Such other examples are intended to be within the scope of the claims if they include structural elements that do not differ from the literal language of the claims, or if they include equivalent structural elements with insubstantial differences from the literal languages of the claims. 

What is claimed is:
 1. An air conditioning appliance defining a vertical direction, the air conditioning appliance comprising: a unit enclosure having a unit wall and defining a system compartment, the unit wall defining an opening therethrough; a housing received within the system compartment; a heat exchanger disposed in the housing; a compressor in fluid communication with the heat exchanger to circulate a refrigerant through the heat exchanger; and an access door attached to the unit wall proximal to the opening, the access door extending along the vertical direction between a bottom end and a top end, the access door defining a primary louver set and a secondary louver set in fluid parallel to permit airflow through the access door to the housing, the primary louver set being defined proximal to the bottom end, and the secondary louver set being defined proximal to the top end above the primary louver set.
 2. The air conditioning appliance of claim 1, wherein the secondary louver set defines a higher airflow resistance than the primary louver set.
 3. The air conditioning appliance of claim 1, wherein the secondary louver set defines a smaller cumulative vent opening than the primary louver set.
 4. The air conditioning appliance of claim 1, further comprising a filter panel mounted to the access door.
 5. The air conditioning appliance of claim 1, further comprising a movable air damper mounted to the access door proximal to the top end, the movable damper being selectively disposed over the secondary louver set to restrict airflow therethrough.
 6. The air conditioning appliance of claim 5, wherein the access door defines a front face directed away from the housing and a rearward face directed toward the housing, and wherein the movable damper is selectively disposed against the rearward face.
 7. The air conditioning appliance of claim 5, wherein the movable air damper is pivotably mounted to the access door.
 8. The air conditioning appliance of claim 5, wherein the movable air damper is slidably mounted to the access door to slide therealong.
 9. The air conditioning appliance of claim 5, further comprising a damper motor in mechanical communication with the movable damper to selectively actuate the movable air damper relative to the secondary louver set.
 10. A door assembly for an air conditioning appliance comprising a housing defining a vertical direction and a front air inlet extending through the housing perpendicular to the vertical direction, the door assembly comprising: an access door mountable to a wall in front of the housing and extending along the vertical direction from a bottom end to a top end, the access door defining a primary louver set extending through the access door proximal to the bottom end to permit airflow through the access door to the front air inlet, and a secondary louver set in fluid parallel to the primary louver set to selectively permit airflow through the access door to the front air inlet, the secondary louver set being defined proximal to the top end above the primary louver set and the front air inlet.
 11. The door assembly of claim 10, wherein the secondary louver set defines a higher airflow resistance than the primary louver set.
 12. The door assembly of claim 10, wherein the secondary louver set defines a smaller cumulative vent opening than the primary louver set.
 13. The door assembly of claim 10, further comprising a filter panel mounted to the access door.
 14. The door assembly of claim 10, further comprising a movable air damper mounted to the access door proximal to the top end, the movable damper being selectively disposed over the secondary louver set to restrict airflow therethrough.
 15. The door assembly of claim 14, wherein the access door defines a front face directed away from the housing and a rearward face directed toward the housing, and wherein the movable damper is selectively disposed against the rearward face.
 16. The door assembly of claim 14, wherein the movable air damper is pivotably mounted to the access door.
 17. The door assembly of claim 14, wherein the movable air damper is slidably mounted to the access door to slide therealong.
 18. The door assembly of claim 14, further comprising a damper motor in mechanical communication with the movable damper to selectively actuate the movable air damper relative to the secondary louver set. 